As an example maybe you're working on something where you want to pay extra attention to the X Axis - Simply open the color picker, select 'X' followed by a color and 'Save' and every X Axis throughout the display area is instantly shown in the new color. As mentioned previously this only affects the display within cncCoder - the colors or other formatting are not applied to the underlying CNC text so does not increase the size of your CNC files or affect the machining process.